Fluorine-lined plug valve is a plug body with a through hole for opening and closing parts, plug body with the stem rotation, to achieve the opening and closing action of the valve. The cock valve opens and closes quickly with little fluid resistance. Because the movement between the sealing surface of the plug valve has a wiping effect, and the contact with the flowing medium can be completely prevented when the valve is fully opened, so it is usually used for the medium of suspended particles. In recent years, as one of the earliest valves used by people in history, not only has not been replaced by lined ball valves and other forms of valves, but also shows a more and more popular trend in the market. Plug valve is used to cut off the flow of media, but also for media distribution (three-way plug valve). This product is widely used in addition to "molten alkali metal and element fluorine" any corrosive medium, in chemical industry, petroleum, medicine, food, iron and steel smelting, paper, hydropower, environmental assurance and other industries have been widely used.